diff --git a/Documentation/NuttX.html b/Documentation/NuttX.html
index a3762e77e19..90d8dd1a0c5 100644
--- a/Documentation/NuttX.html
+++ b/Documentation/NuttX.html
@@ -615,7 +615,7 @@
   <td>
     <p>
       <b>Zilog Z8Encore! Microncontroller</b>.
-      This port use the Zilog z8encore000zco development kit, Z8F642 part, and the Zilog
+      This port use the Zilog z8encore000zco development kit, Z8F6403 part, and the Zilog
       ZDS-II Windows command line tools.
       The development environment is Cygwin under WinXP.
     </p>
@@ -991,7 +991,7 @@ buildroot-0.1.0 2007-03-09 &lt;spudmonkey@racsa.co.cr&gt
 nuttx-0.3.9 2008-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
 
 	* Began adding support for the ZiLOG Z8Encore! microcontroller for the Z8Encore000ZCO
-	  development board and the Z8F642 part.
+	  development board and the Z8F6403 part.
 	* Fix broken 'clean' target on z80sim configurations
 	* Re-structure arch/z80 to provide support for all ZiLOG 8-bit microcontrollers (ez8
 	  in particular for now).
diff --git a/Documentation/NuttxPortingGuide.html b/Documentation/NuttxPortingGuide.html
index 9a668d86c51..fcf74416c56 100644
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -448,7 +448,7 @@
 
       <li><code>arch/z80/include/z8</code> and <code>arch/z80/src/z8</code>:
         The Z8Encore! port use the Zilog z8encore000zco
-        development kit, Z8F642 part, and the Zilog ZDS-II Windows command line
+        development kit, Z8F6403 part, and the Zilog ZDS-II Windows command line
         tools.  The development environment is Cygwin under WinXP.
         This port is in progress and will be released in a future NuttX release.
       </li>
@@ -646,7 +646,7 @@
 
   <li><code>configs/z8encore000zco</code>
     z8Encore! Microncontroller.  This port use the Zilog z8encore000zco
-    development kit, Z8F642 part, and the Zilog ZDS-II Windows command line
+    development kit, Z8F6403 part, and the Zilog ZDS-II Windows command line
     tools.  The development environment is Cygwin under WinXP.
   </li>